Issues you need to pay attention to with php __clone_PHP Tutorial

<span class</span><span  Account{
    </span><span public</span> <span $balance</span><span ;
   </span><span function</span> __construct(<span $balance</span><span ){
       </span><span $this</span>->balance=<span $balance</span><span ;
   }
}

</span><span class</span><span  Person{
  </span><span private</span> <span $name</span><span ;
  </span><span private</span> <span $age</span><span ;
  </span><span private</span> <span $id</span><span ;
  </span><span public</span> <span $account</span><span ;
  </span><span function</span> __construct(<span $name</span>,<span $age</span>,<span $account</span><span ){
      </span><span $this</span>->name=<span $name</span><span ;
      </span><span $this</span>->age=<span $age</span><span ;
      </span><span $this</span>->account=<span $account</span><span ;
  }
  </span><span function</span> setId(<span $id</span><span ){
    </span><span $this</span>->id=<span $id</span><span ;
  }
  </span><span function</span><span  __clone(){
   </span><span $this</span>->id=0<span ;

  }
}
</span><span $p1</span>=<span new</span> Person('tom', 33, <span new</span> Account(200<span ));
</span><span $p1</span>->setId(4<span );

</span><span $p2</span>=<span clone</span> <span $p1</span><span ;
</span><span //</span><span 给$p1充500 </span>
<span $p1</span>->account->balance+=500<span ;
</span><span //</span><span 结果$p2也得到了这笔钱</span>
<span print</span> <span $p2</span>->account->balance; <span //</span><span 700</span>

When a new copy ($p2) is created, the reference saved in the new object ($p2) points to the same $account object referenced by $p1.

If you do not want the object properties to be shared after being copied, you can explicitly copy the object pointed to by in the __clone method

<span function</span><span  __clone(){
   </span><span $this</span>->id=0<span ;
   </span><span $this</span>->account=<span clone</span> <span $this</span>-><span account;

  }</span>

http://www.bkjia.com/PHPjc/745143.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/745143.htmlTechArticle__construct( -balance= __construct( , , -name= -age= -account= setId( -id= - id=0 = Person('tom', 33, Account(200 -setId(4 = -account-balance+=500 -account-balance; When creating a new...